/usr/share/fwbuilder-5.1.0.3599/configlets/fwsm_os/ntp is in fwbuilder-common 5.1.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | ## -*- mode: shell-script; -*-
##
## See http://www.cisco.com/en/US/products/hw/modules/ps2706/products_configuration_example09186a00808b4d9f.shtml
##
## Cisco says:
## "Note: NTP cannot be configured on FWSM, because it takes its settings from the Switch."
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